| Summary: | The dehydrogenation of low-carbon alkane to obtain olefins is an effective way to meet the steadily increasing demand of these building blocks in chemical industry. In this study, Ca-doped CrO<sub>x</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalysts were fabricated via a one-pot method by employing Cr(OH)<sub>3</sub> as the precursor, and their catalytic performances were tested in the dehydrogenation of isobutane to isobutene (DITI) process. The prepared catalysts were intensively characterized by XRD, SEM, NH<sub>3</sub>-TPD, H<sub>2</sub>-TPR, low-temperature N<sub>2</sub> adsorption−desorption, etc. These characterization results indicated that the doping of Ca into the CrO<sub>x</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalysts could tune the acidity properties of the prepared catalysts and enhance the interaction between the active species and support. The Ca-doped CrO<sub>x</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalysts, especially the Ca2-Cr/γ-Al<sub>2</sub>O<sub>3</sub> catalyst with a Ca doping of 2 wt%, exhibited a superior catalytic performance in the DITI process in comparison with the undoped catalyst.
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